# NFP Charting vs Chart35

The clearest difference is in-app purchases: Chart35 at none against NFP Charting's 6. Chart35 also leads on update cadence (every 6 days vs every 4 months). NFP Charting's advantage is iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. NFP Charting sells 6 one-off in-app purchases. Chart35 asks for nothing beyond the download.

NFP Charting ships an update every 4 months, Chart35 every 6 days. The most recent releases landed on June 11, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | NFP Charting | Chart35 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/nfp-charting/id300767738/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 49.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 5 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Lawson Culver](https://appshunter.io/developer/300767741) | [Stephens Page LLC](https://appshunter.io/developer/6777773686) |

## What reviewers say

### NFP Charting

[App page](https://appshunter.io/ios/app/nfp-charting/id300767738)

Track your Natural Family Planning (NFP) charts online using the Billings Ovulation Method. This app allows you to enter data, share charts with your teacher, and view current and previous cycles. It is designed for users already trained in the Billings Ovulation Method.

**Highlights:** Track NFP charting data online, Share charts with teachers, Email charts, View current and previous cycles, Leave notes for teachers, Access from computer

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Account Extension | $2.99 | one-time |
| One Month | $2.99 | one-time |
| Six Months Account Extension | $11.99 | one-time |
| Six Months | $14.99 | one-time |
| One Year Account Extension | $19.99 | one-time |
| One Year | $24.99 | one-time |


### Chart35

[App page](https://appshunter.io/ios/app/chart35/id6784113411)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is NFP Charting free?

NFP Charting is free to download, with in-app purchases available.

### Is Chart35 free?

Chart35 is free to download, with no in-app purchases.

### Do NFP Charting or Chart35 have ads?

Neither NFP Charting nor Chart35 shows ads.

### Which is updated more often, NFP Charting or Chart35?

NFP Charting ships an update every 4 months, and Chart35 every 6 days. Most recently, NFP Charting was updated on June 11, 2026 and Chart35 on September 19, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*